Fix Windows 11 Brightness Not Working (2026 Guide)

Being able to adjust screen brightness matters for comfort, battery life, and eye strain. When Windows 11 brightness stops working—the slider is greyed out, the screen stays at full brightness, or the keyboard keys do nothing—evening use becomes painful.

This guide covers 9 proven solutions to fix brightness issues in Windows 11.

PAGE CONTENT

• Common Windows 11 Brightness Problems
• Fix 1: Update the Display Adapter Driver
• Fix 2: Reinstall the Generic PnP Monitor Driver
• Fix 3: Check the Power Plan and Adaptive Brightness
• Fix 4: Turn Off Adaptive Brightness in Settings
• Fix 5: Use the Keyboard Brightness Keys Correctly
• Fix 6: Roll Back the Display Driver After an Update
• Fix 7: Check Night Light, HDR, and Color Profiles
• Fix 8: Adjust the Monitor's Own Brightness Buttons
• Fix 9: Run Windows Update and Reset Power Options
• FAQs About Windows 11 Brightness Issues
• Back Up and Restore Windows with Qiling Disk Master

Common Windows 11 Brightness Problems

Users report different brightness issues in Windows 11:

• The brightness slider is missing from Quick Settings
• The brightness slider is greyed out and cannot be moved
• The screen stays at maximum or minimum brightness
• Brightness keys on the keyboard do nothing
• The screen dims or brightens on its own
• Brightness control disappeared after a Windows update
• An external monitor cannot change brightness
• The screen is still too dark at 100% brightness

Fix 1: Update the Display Adapter Driver

The brightness slider depends on the graphics driver. If the driver is outdated, generic, or corrupted, Windows loses control of brightness.

Step 1. Press Win + X and select "Device Manager".

Step 2. Expand "Display adapters".

Step 3. Right-click your graphics adapter, for example Intel UHD Graphics, AMD Radeon, or NVIDIA GeForce, and select "Update driver".

Step 4. Choose "Search automatically for drivers" and follow the prompts.

Step 5. For laptops with switchable graphics, also install the latest chipset and Intel or AMD graphics driver from your manufacturer's support page.

Step 6. Restart your PC and check the brightness slider again.

Fix 2: Reinstall the Generic PnP Monitor Driver

Windows sometimes loads the wrong monitor driver after an update, which removes brightness control. Reinstalling the driver rebuilds it correctly.

Step 1. Open Device Manager and expand "Monitors".

Step 2. Right-click your monitor, usually "Generic PnP Monitor", and select "Uninstall device".

Step 3. Check "Attempt to remove the driver for this device" if the option appears.

Step 4. Click "Uninstall".

Step 5. Click "View" > "Show hidden devices" and remove any greyed-out monitor entries as well.

Step 6. Restart your PC. Windows reinstalls the monitor driver automatically, and the brightness slider should return.

Fix 3: Check the Power Plan and Adaptive Brightness

A power plan that hides brightness control, or a low battery state, can lock the screen at one brightness level.

Step 1. Press Win + R, type powercfg.cpl, and press Enter.

Step 2. Select your active plan and click "Change plan settings".

Step 3. Click "Change advanced power settings".

Step 4. Expand "Display" > "Enable adaptive brightness" and set both "On battery" and "Plugged in" to "Off".

Step 5. Expand "Display" > "Display brightness" and confirm both values are set to a usable level.

Step 6. Apply the changes and test the brightness keys.

Fix 4: Turn Off Adaptive Brightness in Settings

Adaptive brightness adjusts the screen based on ambient light and can override your manual settings on some devices.

Step 1. Press Win + I to open Settings.

Step 2. Go to "System" > "Display".

Step 3. Open the "Brightness" section.

Step 4. Clear the check box "Change brightness automatically when lighting changes".

Step 5. Also turn off "Change brightness based on content" if it is listed, as it dims the screen in dark apps.

Step 6. If the option is missing, use the registry: open Registry Editor, go to HKLM\SYSTEM\CurrentControlSet\Control\Class, find the "FeatureTestControl" value under your graphics adapter key, and set it to 0 before restarting.

Fix 5: Use the Keyboard Brightness Keys Correctly

Brightness keys often fail because the function row is set to media mode or because the hotkey driver is missing.

Step 1. Press the brightness key, usually a sun icon on F1, F2, F11, or F12, once on its own.

Step 2. If nothing happens, hold Fn and press the same key.

Step 3. Try toggling Fn Lock with Fn + Esc and test the keys again.

Step 4. Install your laptop's hotkey, Function Key, or System Interface Foundation utility from the manufacturer's support page.

Step 5. Test the brightness keys once more after restarting.

Fix 6: Roll Back the Display Driver After an Update

If brightness control worked before a Windows update and disappeared afterwards, the new display driver is the most likely cause.

Step 1. Open Device Manager and expand "Display adapters".

Step 2. Right-click your graphics adapter and select "Properties".

Step 3. Open the "Driver" tab.

Step 4. Click "Roll Back Driver" if it is available, then restart your PC.

Step 5. If the button is greyed out, uninstall the update instead: go to Settings > "Windows Update" > "Update history" > "Uninstall updates".

Step 6. Pause updates temporarily so the faulty driver is not reinstalled before you test the fix.

Fix 7: Check Night Light, HDR, and Color Profiles

Night Light, HDR mode, and third-party color profiles can make brightness look stuck even when the slider works.

Step 1. Press Win + I and go to "System" > "Display".

Step 2. Open "Night light" and turn it off, then check the brightness slider.

Step 3. Open "HDR" and turn "Use HDR" off, since HDR disables the normal brightness control on many screens.

Step 4. Open "Advanced display" and set "Automatically manage color for apps" to "Off" if it is enabled.

Step 5. In the Color Management control panel, remove any custom ICC profile and restore the default sRGB profile.

Step 6. Restart your PC and test brightness again.

Fix 8: Adjust the Monitor's Own Brightness Buttons

On desktop monitors and some external displays, brightness is controlled by the monitor itself, not by Windows.

Step 1. Press the physical menu button on your monitor, usually on the bottom edge or the back right side.

Step 2. Open "Brightness" or "Picture" in the on-screen menu.

Step 3. Adjust the brightness value using the monitor buttons.

Step 4. If the value is greyed out, turn off HDR, Dynamic Contrast, or Eco mode in the same menu.

Step 5. For a laptop connected to an external screen, note that the built-in brightness slider only affects the laptop panel, not the external monitor.

Fix 9: Run Windows Update and Reset Power Options

If brightness control is still locked, update Windows and reset the power configuration to clear a broken display setting.

Step 1. Press Win + I and go to "Windows Update" > "Check for updates".

Step 2. Install all updates, including optional driver updates listed under "Advanced options" > "Optional updates".

Step 3. Press Win + R, type cmd, right-click "Command Prompt", and select "Run as administrator".

Step 4. Run powercfg -restoredefaultschemes to restore the default power plans.

Step 5. Run sfc /scannow and then DISM /Online /Cleanup-Image /RestoreHealth to repair system files that manage display settings.

Step 6. Restart your PC and check whether the brightness slider works.

FAQs About Windows 11 Brightness Issues

Why is the brightness slider greyed out in Windows 11?

A greyed-out slider almost always means the graphics or monitor driver is wrong or missing. Reinstall the Generic PnP Monitor driver in Device Manager, then update the display adapter driver from Intel, AMD, NVIDIA, or your laptop manufacturer.

How do I get the brightness slider back?

Open Device Manager, expand "Monitors", uninstall "Generic PnP Monitor", and restart your PC so Windows reinstalls it. Also turn off adaptive brightness under Settings > System > Display > Brightness.

Why do my brightness keys not work?

The function row may be in media mode, or the hotkey driver may be missing. Hold Fn while pressing the brightness key, try Fn + Esc to toggle Fn Lock, and install your laptop's hotkey utility from the manufacturer's website.

Why does my screen dim or brighten on its own?

Adaptive brightness is changing the level based on ambient light or screen content. Turn off "Change brightness automatically when lighting changes" and "Change brightness based on content" under Settings > System > Display, and disable adaptive brightness in the advanced power settings.

Why can't I change the brightness on an external monitor?

The Windows brightness slider only controls the built-in laptop panel. External monitors use their own on-screen menu, so press the monitor's physical buttons and adjust brightness there. If the option is greyed out, disable HDR and Dynamic Contrast first.

Back Up and Restore Windows with Qiling Disk Master

Before you roll back a display driver, reset the power plan, or reinstall Windows, create a full system backup. Brightness problems are usually solved by driver changes, and if a new driver makes the screen worse or Windows will not start, a system image lets you go back in minutes. Qiling Disk Master handles both the backup and the restore.

• Free Download
• Windows 11/10/8/7, 100% Secure

Part 1: Create a Full System Backup

Step 1. Install and open Qiling Disk Master. On the home screen, open "Backup and Recovery" and choose "System Backup". This option automatically includes Windows and the hidden boot partitions, so you do not have to select them one by one.

Step 2. Check the source. The disk where Windows is installed and its system partitions are already ticked for you. If you only need your personal documents, run a separate "File Backup" task instead.

Step 3. Click the destination box and choose where the image should be saved. Use an external HDD or SSD, a NAS, or any drive other than the one you are about to repair, and make sure it has enough free space.

Step 4. Review the task summary and click "Proceed". Wait until the progress bar reaches 100%. Do not unplug the drive or turn off the PC while the backup is running.

Part 2: Restore Windows from the Backup

Step 1. Open Qiling Disk Master again, go to "Backup and Recovery", and select the recovery option. Your backup images are listed, so pick the one you created before the repair.

Step 2. Choose the target disk or partition. Normally you restore to the original system disk. If the drive was replaced, select the new disk instead, and the restore rebuilds Windows together with its boot partitions.

Step 3. Preview the restore plan, click "Proceed", and confirm the warning. The PC restarts to finish the job, and Windows comes back exactly as it was on the day the image was created.

Conclusion

Windows 11 brightness not working is usually fixed by reinstalling the monitor or display adapter driver, turning off adaptive brightness, and correcting the power plan. Start with the display driver in Device Manager, then check Night Light, HDR, and the monitor's own buttons. If the slider is still greyed out, run Windows Update and reset the power schemes to restore normal brightness control.

For more Windows 11 troubleshooting, see our guides on Camera Not Working, No Sound, and No Signal to Monitor.

Related Articles

• Fix Windows 11 Camera Not Working (2026 Guide)
• Fix Windows 11 No Sound (2026 Guide)
• How to Change Monitor 1 and 2 on Windows
• Computer Turns On But No Signal to Monitor? Here's How to Fix It
  If your display stays black or ignores brightness changes, the problem may be the video signal itself. Learn how to test cables, reseat the GPU, and check BIOS output.
• How to Fix Windows 11 Slow Startup
  Broken display and graphics drivers can also delay startup and login. Learn how to shorten boot time by trimming startup apps, services, and Fast Startup settings.
• 3 Ways | How to Reinstall Windows 10 Without CD
  If display problems persist after every fix, a clean reinstall often solves them. Learn 3 ways to reinstall Windows without a CD or DVD drive.